Accession Number : ADD004201

Title :   Diver's Piezoelectric Microphone with Integral AGC Preamplifier.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Dewberry,Larry F ; Banks,Robert H ; Dildy,Clell A

Report Date : 22 Mar 1977

Pagination or Media Count : 5

Abstract : An improved microphone assembly for use in a diver's mask or helmet and which is characterized by a substantially flat frequency response at pressures from 1 to 30 or more atmospheres of breathing gas. A silicone rubber coated piezoelectric diaphragm is mounted by its periphery in a cylindrical housing with both sides of the diaphragm exposed to ambient gas pressures. A ground plate is mounted in said housing with one side in spaced relation to the diaphragm and having on the other side thereof a preamplifier and automatic gain control circuit electrically connected to the diaphragm and encased in waterproof potting compound. (Author)

Descriptors :   *Patents, *Microphones, *Piezoelectric materials, *Diver equipment, Frequency response, High pressure, Automatic gain control, Preamplifiers, Sensitivity

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE